/Engine/Plugins/Online/OnlineSubsystem/Source/Public/Interfaces/OnlineChatInterface.h
Delegate used when a private chat message is received from another user
typedef TMulticastDelegate_TwoParams< void, const [FUniqueNetId](API\Runtime\CoreOnline\Online\FUniqueNetId) &, const [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [FChatMessage](API\Plugins\OnlineSubsystem\Interfaces\FChatMessage) > & > FOnChatPrivateMessageReceived